This bug ("No system tray detected on this system") also occured years ago and a workaround was to change ~/hplip-systray.desktop to increase the "sleep" time:
Exec=sh -c "sleep 60; exec hp-systray" but this does not work anymore after the latest Ubuntu update. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1908921 Title: No system tray detected by hp-systray To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell-extension-appindicator/+bug/1908921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs